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<title>Hadoop 0.20.1 Release Notes</title>
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<h1>Hadoop 0.20.1 Release Notes</h1>
		These release notes include new developer and user-facing incompatibilities, features, and major improvements. The table below is sorted by Component.

		<a name="changes"></a>
<h2>Changes Since Hadoop 0.20.0</h2>

<h3>Common</h3>

<h4>        Sub-task
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6213'>HADOOP-6213</a>] -         Remove commons dependency on commons-cli2
</li>
</ul>
    
<h4>        Bug
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4626'>HADOOP-4626</a>] -         API link in forrest doc should point to the same version of hadoop.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4674'>HADOOP-4674</a>] -         hadoop fs -help should list detailed help info for the following commands: test, text, tail, stat &amp; touchz
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4856'>HADOOP-4856</a>] -         Document JobInitializationPoller configuration in capacity scheduler forrest documentation.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-4931'>HADOOP-4931</a>] -         Document TaskTracker's memory management functionality and CapacityScheduler's memory based scheduling.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5210'>HADOOP-5210</a>] -         Reduce Task Progress shows &gt; 100% when the total size of map outputs (for a single reducer) is high 
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5213'>HADOOP-5213</a>] -         BZip2CompressionOutputStream NullPointerException
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5349'>HADOOP-5349</a>] -         When the size required for a path is -1, LocalDirAllocator.getLocalPathForWrite fails with a DiskCheckerException when the disk it selects is bad.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5533'>HADOOP-5533</a>] -         Recovery duration shown on the jobtracker webpage is inaccurate
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5539'>HADOOP-5539</a>] -         o.a.h.mapred.Merger not maintaining map out compression on intermediate files
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5636'>HADOOP-5636</a>] -         Job is left in Running state after a killJob
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5641'>HADOOP-5641</a>] -         Possible NPE in CapacityScheduler's MemoryMatcher
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5646'>HADOOP-5646</a>] -         TestQueueCapacities is failing Hudson tests for the last few builds
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5648'>HADOOP-5648</a>] -         Not able to generate gridmix.jar on already compiled version of hadoop
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5654'>HADOOP-5654</a>] -         TestReplicationPolicy.&lt;init&gt; fails on java.net.BindException
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5655'>HADOOP-5655</a>] -         TestMRServerPorts fails on java.net.BindException
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5688'>HADOOP-5688</a>] -         HftpFileSystem.getChecksum(..) does not work for the paths with scheme and authority
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5691'>HADOOP-5691</a>] -         org.apache.hadoop.mapreduce.Reducer should not be abstract.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5711'>HADOOP-5711</a>] -         Change Namenode file close log to info
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5718'>HADOOP-5718</a>] -         Capacity Scheduler should not check for presence of default queue while starting up.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5719'>HADOOP-5719</a>] -         Jobs failed during job initalization are never removed from Capacity Schedulers waiting list
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5736'>HADOOP-5736</a>] -         Update CapacityScheduler documentation to reflect latest changes
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5746'>HADOOP-5746</a>] -         Errors encountered in MROutputThread after the last map/reduce call can go undetected
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5796'>HADOOP-5796</a>] -         DFS Write pipeline does not detect defective datanode correctly in some cases (HADOOP-3339)
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5828'>HADOOP-5828</a>] -         Use absolute path for JobTracker's mapred.local.dir in MiniMRCluster
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5850'>HADOOP-5850</a>] -         map/reduce doesn't run jobs with 0 maps
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5863'>HADOOP-5863</a>] -         mapred metrics shows negative count of waiting maps and reduces 
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5869'>HADOOP-5869</a>] -         TestQueueCapacitisues.apache.org/jjira/browse/HADOOP-OP-6017</a>] -         NameNode and SecondaryNameNode fail to restart because of abnormal filenames.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6097'>HADOOP-6097</a>] -         Multiple bugs w/ Hadoop archives
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6139'>HADOOP-6139</a>] -         Incomplete help message is displayed for rm and rmr options.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6141'>HADOOP-6141</a>] -         hadoop 0.20 branch &quot;test-patch&quot; is broken
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6145'>HADOOP-6145</a>] -         No error message for deleting non-existant file or directory.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6215'>HADOOP-6215</a>] -         fix GenericOptionParser to deal with -D with '=' in the value
</li>
</ul>
    
<h4>        Improvement
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5726'>HADOOP-5726</a>] -         Remove pre-emption from the capacity scheduler code base
</li>
</ul>
    
<h4>        New Feature
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-3315'>HADOOP-3315</a>] -         New binary file format
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-5714'>HADOOP-5714</a>] -         Metric to show number of fs.exists (or number of getFileInfo) calls
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HADOOP-6080'>HADOOP-6080</a>] -         Handling of  Trash with quota
</li>
</ul>

<h3>HDFS</h3>

<h4>        Bug
</h4>
<ul>
  <li>[<a href='https://issues.apache.org/jira/browse/HDFS-26'>HDFS-26</a>] -           HADOOP-5862 for version .20  (Namespace quota exceeded message unclear)
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-167'>HDFS-167</a>] -         DFSClient continues to retry indefinitely
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-438'>HDFS-438</a>] -         Improve help message for quotas
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-442'>HDFS-442</a>] -         dfsthroughput in test.jar throws NPE
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-485'>HDFS-485</a>] -         error : too many fetch failures
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-495'>HDFS-495</a>] -         Hadoop FSNamesystem startFileInternal() getLease() has bug
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-525'>HDFS-525</a>] -         ListPathsServlet.java uses static SimpleDateFormat that has threading issues
</li>
</ul>
    
<h4>        Improvement
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-504'>HDFS-504</a>] -         HDFS updates the modification time of a file when the file is closed.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/HDFS-527'>HDFS-527</a>] -         Refactor DFSClient constructors
</li>
</ul>
                                
<h3>Map/Reduce</h3>

<h4>        Bug
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-2'>MAPREDUCE-2</a>] -         ArrayOutOfIndex error in KeyFieldBasedPartitioner on empty key
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-18'>MAPREDUCE-18</a>] -         Under load the shuffle sometimes gets incorrect data
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-40'>MAPREDUCE-40</a>] -         Memory management variables need a backwards compatibility option after HADOOP-5881
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-112'>MAPREDUCE-112</a>] -         Reduce Input Records and Reduce Output Records counters are not being set when using the new Mapreduce reducer API
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-124'>MAPREDUCE-124</a>] -         When abortTask of OutputCommitter fails with an Exception for a map-only job, the task is marked as success
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-130'>MAPREDUCE-130</a>] -         Delete the jobconf copy from the log directory of the JobTracker when the job is retired
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-179'>MAPREDUCE-179</a>] -         setProgress not called for new RecordReaders
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-383'>MAPREDUCE-383</a>] -         pipes combiner does not reset properly after a spill
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-421'>MAPREDUCE-421</a>] -         mapred pipes might return exit code 0 even when failing
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-430'>MAPREDUCE-430</a>] -         Task stuck in cleanup with OutOfMemoryErrors
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-565'>MAPREDUCE-565</a>] -         Partitioner does not work with new API
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-657'>MAPREDUCE-657</a>] -         CompletedJobStatusStore hardcodes filesystem to hdfs
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-687'>MAPREDUCE-687</a>] -         TestMiniMRMapRedDebugScript fails sometimes
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-735'>MAPREDUCE-735</a>] -         ArrayIndexOutOfBoundsException is thrown by KeyFieldBasedPartitioner
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-745'>MAPREDUCE-745</a>] -         TestRecoveryManager fails sometimes
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-796'>MAPREDUCE-796</a>] -         Encountered &quot;ClassCastException&quot; on tasktracker while running wordcount with MultithreadedMapRunner
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-805'>MAPREDUCE-805</a>] -         Deadlock in Jobtracker
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-806'>MAPREDUCE-806</a>] -         WordCount example does not compile given the current instructions
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-807'>MAPREDUCE-807</a>] -         Stray user files in mapred.system.dir with permissions other than 777 can prevent the jobtracker from starting up.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-818'>MAPREDUCE-818</a>] -         org.apache.hadoop.mapreduce.Counters.getGroup returns null if the group name doesnt exist.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-827'>MAPREDUCE-827</a>] -         &quot;hadoop job -status &lt;jobid&gt;&quot; command should display job's completion status also.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-832'>MAPREDUCE-832</a>] -         Too many WARN messages about deprecated memorty config variables in JobTacker log
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-834'>MAPREDUCE-834</a>] -         When TaskTracker config use old memory management values its memory monitoring is diabled.
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-838'>MAPREDUCE-838</a>] -         Task succeeds even when committer.commitTask fails with IOException
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-911'>MAPREDUCE-911</a>] -         TestTaskFail fail sometimes
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-924'>MAPREDUCE-924</a>] -         TestPipes crashes on trunk
</li>
</ul>
    
<h4>        Improvement
</h4>
<ul>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-465'>MAPREDUCE-465</a>] -         Deprecate org.apache.hadoop.mapred.lib.MultithreadedMapRunner
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-487'>MAPREDUCE-487</a>] -         DBInputFormat support for Oracle
</li>
<li>[<a href='https://issues.apache.org/jira/browse/MAPREDUCE-767'>MAPREDUCE-767</a>] -         to remove mapreduce dependency on commons-cli2
</li>
</ul>

<h2>Changes Since Hadoop 0.19.1</h2>
<table border="1">
<tr bgcolor="#DDDDDD">
<th align="left">Issue</th><th align="left">Component</th><th align="left">Notes</th>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3344">HADOOP-3344</a></td><td>build</td><td>Changed build procedure for libhdfs to build correctly for different platforms. Build instructions are in the Jira item.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4253">HADOOP-4253</a></td><td>conf</td><td>Removed  from class org.apache.hadoop.fs.RawLocalFileSystem deprecated methods public String getName(), public void lock(Path p, boolean shared) and public void release(Path p).</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4454">HADOOP-4454</a></td><td>conf</td><td>Changed processing of conf/slaves file to allow # to begin a comment.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4631">HADOOP-4631</a></td><td>conf</td><td>Split hadoop-default.xml into core-default.xml, hdfs-default.xml and mapreduce-default.xml.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4035">HADOOP-4035</a></td><td>contrib/capacity-sched</td><td>Changed capacity scheduler policy to take note of task memory requirements and task tracker memory availability.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4445">HADOOP-4445</a></td><td>contrib/capacity-sched</td><td>Changed JobTracker UI to better present the number of active tasks.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4576">HADOOP-4576</a></td><td>contrib/capacity-sched</td><td>Changed capacity scheduler UI to better present number of running and pending tasks.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4179">HADOOP-4179</a></td><td>contrib/chukwa</td><td>Introduced Vaidya rule based performance diagnostic tool for Map/Reduce jobs.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4827">HADOOP-4827</a></td><td>contrib/chukwa</td><td>Improved framework for data aggregation in Chuckwa.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4843">HADOOP-4843</a></td><td>contrib/chukwa</td><td>Introduced Chuckwa collection of job history.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-5030">HADOOP-5030</a></td><td>contrib/chukwa</td><td>Changed RPM install location to the value specified by build.properties file.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-5531">HADOOP-5531</a></td><td>contrib/chukwa</td><td>Disabled Chukwa unit tests for 0.20 branch only.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4789">HADOOP-4789</a></td><td>contrib/fair-share</td><td>Changed fair scheduler to divide resources equally between pools, not jobs.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4873">HADOOP-4873</a></td><td>contrib/fair-share</td><td>Changed fair scheduler UI to display minMaps and minReduces variables.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3750">HADOOP-3750</a></td><td>dfs</td><td>Removed deprecated method parseArgs from org.apache.hadoop.fs.FileSystem.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4029">HADOOP-4029</a></td><td>dfs</td><td>Added name node storage information to the dfshealth page, and moved data node information to a separated page.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4103">HADOOP-4103</a></td><td>dfs</td><td>Modified dfsadmin -report to report under replicated blocks. blocks with corrupt replicas, and missing blocks&quot;.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4567">HADOOP-4567</a></td><td>dfs</td><td>Changed GetFileBlockLocations to return topology information for nodes that host the block replicas.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4572">HADOOP-4572</a></td><td>dfs</td><td>Moved org.apache.hadoop.hdfs.{CreateEditsLog, NNThroughputBenchmark} to org.apache.hadoop.hdfs.server.namenode.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4618">HADOOP-4618</a></td><td>dfs</td><td>Moved HTTP server from FSNameSystem to NameNode. Removed FSNamesystem.getNameNodeInfoPort(). Replaced FSNamesystem.getDFSNameNodeMachine() and FSNamesystem.getDFSNameNodePort() with new method  FSNamesystem.getDFSNameNodeAddress(). Removed constructor NameNode(bindAddress, conf).</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4826">HADOOP-4826</a></td><td>dfs</td><td>Introduced new dfsadmin command saveNamespace to command the name service to do an immediate save of the file system image.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4970">HADOOP-4970</a></td><td>dfs</td><td>Changed trash facility to use absolute path of the deleted file.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-5468">HADOOP-5468</a></td><td>documentation</td><td>Reformatted HTML documentation for Hadoop to use submenus at the left column.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3497">HADOOP-3497</a></td><td>fs</td><td>Changed the semantics of file globbing with a PathFilter (using the globStatus method of FileSystem). Previously, the filtering was too restrictive, so that a glob of /*/* and a filter that only accepts /a/b would not have matched /a/b. With this change /a/b does match. </td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4234">HADOOP-4234</a></td><td>fs</td><td>Changed KFS glue layer to allow applications to interface with multiple KFS metaservers.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4422">HADOOP-4422</a></td><td>fs/s3</td><td>Modified Hadoop file system to no longer create S3 buckets. Applications can create buckets for their S3 file systems by other means, for example, using the JetS3t API.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3063">HADOOP-3063</a></td><td>io</td><td>Introduced BloomMapFile subclass of MapFile that creates a Bloom filter from all keys.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-1230">HADOOP-1230</a></td><td>mapred</td><td>Replaced parameters with context obejcts in Mapper, Reducer, Partitioner, InputFormat, and OutputFormat classes.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-1650">HADOOP-1650</a></td><td>mapred</td><td>Upgraded all core servers to use Jetty 6</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3923">HADOOP-3923</a></td><td>mapred</td><td>Moved class org.apache.hadoop.mapred.StatusHttpServer to org.apache.hadoop.http.HttpServer.</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3986">HADOOP-3986</a></td><td>mapred</td><td>Removed classes org.apache.hadoop.mapred.JobShell and org.apache.hadoop.mapred.TestJobShell. Removed from JobClient methods static void  setCommandLineConfig(Configuration conf) and public static Configuration getCommandLineConfig().</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4188">HADOOP-4188</a></td><td>mapred</td><td>Removed Task's dependency on concrete file systems by taking list from FileSystem class. Added statistics table to FileSystem class. Deprecated FileSystem method getStatistics(Class&lt;? extends FileSystem&gt; cls).</td>
</tr>
<tr>
<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4210">HADOOP-4210</a></td><td>mapred</td><td>Changed public class org.apache.hadoop.mapreduce.ID to be an abstract class. Removed from class org.apache.hadoop.mapreduce.ID the methods  public static ID read(DataInput in) and public static ID forName(String str).</td>
</tr>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4305">HADOOP-4305</a></td><td>mapred</td><td>Improved TaskTracker blacklisting strategy to better exclude faulty tracker from executing tasks.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4435">HADOOP-4435</a></td><td>mapred</td><td>Changed JobTracker web status page to display the amount of heap memory in use. This changes the JobSubmissionProtocol.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4565">HADOOP-4565</a></td><td>mapred</td><td>Improved MultiFileInputFormat so that multiple blocks from the same node or same rack can be combined into a single split.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4749">HADOOP-4749</a></td><td>mapred</td><td>Added a new counter REDUCE_INPUT_BYTES.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4783">HADOOP-4783</a></td><td>mapred</td><td>Changed history directory permissions to 750 and history file permissions to 740.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-3422">HADOOP-3422</a></td><td>metrics</td><td>Changed names of ganglia metrics to avoid conflicts and to better identify source function.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4284">HADOOP-4284</a></td><td>security</td><td>Introduced HttpServer method to support global filters.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4575">HADOOP-4575</a></td><td>security</td><td>Introduced independent HSFTP proxy server for authenticated access to clusters.</td>
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<td><a href="https://issues.apache.org:443/jira/browse/HADOOP-4661">HADOOP-4661</a></td><td>tools/distcp</td><td>Introduced distch tool for parallel ch{mod, own, grp}.</td>
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